sqllogicaltest: fix unstable slt case. (apache#5095)

* sqllogicaltest: fix unstable slt case.

* sqllogicaltest: fix unstable slt case.

datafusion/core/tests/sqllogictests/test_files/union.slt

@@ -80,6 +80,7 @@ query I
 SELECT 1 as x
 UNION ALL
 SELECT 2 as x
+ORDER BY x
 ----
 1
 2
@@ -119,6 +120,7 @@ query I
 SELECT 1 as x
 UNION
 SELECT 1 as x
+ORDER BY x
 ----
 1
 
@@ -147,33 +149,32 @@ SELECT COUNT(*) FROM (
 
 # union_schemas
 query I
-SELECT 1 A UNION ALL SELECT 2 order by 1
+SELECT 1 A UNION ALL SELECT 2 ORDER BY 1
 ----
 1
 2
 
 # union_schemas
 query I
-SELECT 1 UNION SELECT 2 order by 1
+SELECT 1 UNION SELECT 2 ORDER BY 1
 ----
 1
 2
 
 # union_with_except_input
 query T
-SELECT * FROM (
- (
- SELECT name FROM t1
- EXCEPT
- SELECT name FROM t2
- )
- UNION ALL
- (
- SELECT name FROM t2
- EXCEPT
- SELECT name FROM t1
- )
-) ORDER BY name
+(
+ SELECT name FROM t1
+ EXCEPT
+ SELECT name FROM t2
+)
+UNION ALL
+(
+ SELECT name FROM t2
+ EXCEPT
+ SELECT name FROM t1
+)
+ORDER BY name
 ----
 Alice
 John
@@ -191,6 +192,7 @@ UNION ALL
  EXCEPT
  SELECT id, name FROM t1
 )
+ORDER BY name
 ----
 3 Alice
 3 John